Rotary oil burner



I. .M. SHARP- ROTARY QH. BURNER.

APPLICATION FILED APR. 16, 1919.

Patented Oct. 24, 1922.

INVENTOR ATTORNEYS 21a F pr Ll affa- ISAAC M. SHARE, 0]? SAN FRANCISCO,CALIFORNIA.

ROTARY OIL implication filedl April 16,

To all whom it may concern Be it known that l, Issac M. SHARP, a citizenof the United States, residing at the city and county of San Franciscoand ti State of California, have invented new and useful Improvements inRotary Oil Burners, of which the following is a specification.

This invention relates to an oil burner and particularly to a burner ofthe rotary is type in which the oil is atomized and projected by meansof centrifugal force.

One of the objects of'the present invention is to provide a simple,substantial and cheaply manufactured oil" burner of the roi5 tary type,in which the oil is atomized and projected into the furnace by means ofcentrifugal force and in conjunctiontherewith to provide means forintroducing a sufiicient volume of air to support combustion.

Another object of the invention is to pro vide a novel form of atomizinghead, means for delivering oil thereto, and means for Ohtaining an evendistribution of the oil within the head before it is centrifugallydischarged.

Another object of the invention is to provide means actuated by theincoming air for transmitting a rotary movement to the atomizing headand also to provide means for by-passing a sufficient volume of airthrough the atomizing head to prevent overheating of the same.

Further objects will hereinafter appear. The invention consists of thearts and the construction, combination an arrangement of parts ashereinafter more fully" described and claimed, having reference to theaccompanying drawings, in which- Fig. 1 is a longitudinal verticalsection so through the burner.

Fig. 2 is a cross-section'on line 2-42, Fig. 1. Referring to thedrawings in detail, A indicates a cylindrical shaped casing, in one ofwhich is adjustably mounted a nozzle 2. This nozzle is threaded, as at3, and turning movement of the nozzle will. therefore permitlongitudinal adjustment of the same with relation to casing A and theatomizing head gener: indicated at B, as "will hereinafterbe described.The opposite of the casing is closed. oy means of a This head member isin head member his instance provided for two purposes; t, that orsupporting a bearing g and secondly, that supporting onnection 6 throughwhich th oil to be 191a Eerialito. asoses.

is admitted. The bearing member 5 is screwed into the head 4, as shownat 7. It may, however, be constructed integral with the casing, ifdesired. Formed in the outer 60 end of the bearing member is a centralchamber 8 and mounted within said chamber are a pair of ball bearings 9in which is journaled a hollow shaft 10. Extending through the hollowshaft and supported by the bearing member is a stationary fueldelivering pipe 11. This pipe is threaded and is screwed into thebearing member, as at p 12. The pipe communicates with the main deliverypipe 6, through means of a passage 13 formed in the bearing member andit serves the function of delivering the oil to the centrifugal atomizerB.

Suitably secured on the outer end of the hollow shaft is a head member14 in which is formed a plurality of longitudinally disposed o enings 15and a plurality of radially dispose openings 16. Formed on the outer endof the head is a threaded extension 17 on which is secured a cap plate18. Suit- 8 ably secured exterior of the head member 1a is a cup-shapedatomizer 19, which is provided with an annular discharge lip 20. Formedbetween the head member by means of the threaded extension 17 and thecap plate 18 is a central chamber 21, into which the stationary oildelivering pipe 11 projects. Secured on the outer end of said pipe andwithin the chamber 23. are a pair of inverted cap members 22 and. 23 andformed 1' between said caps are a plurality of radially disposedopenings 24 through which the oil is permitted to discharge. The cap 23larger in diameter than the inner cap 22, thus permitting the larger capto partly enclose the inner cap. This is of considerable importance asthe oil discharging through the radial openings 24 is thereby projectingdownwardly into the bottom portion of chamber 21 where it is permittedto di charge into the cup 19 through the openings 16. The caps 22 and 23are or further importance as they prevent the oil dnehsrgmg fromstriking the plate 1 '22." not.

which is often so hot during the oper.

of the burner that carbon rnig t be for By referring to 1, it wii theouter end of the nozzle 2 is l tiered, as at 25; also, that th of theato importance as it serves the function of a seat. with relation towhich the discharge end 25 of the nozzle may be adjusted therebycontrolling the volume of air discharging between the atomizing cup andthe nozzle.

Secured on the hollow shaft 10 or formed integral therewith, is aspiral-shaped vane 27 and forming a connection with one end of thecasing a is a pipe 28 to which air is delivered by means of a blower orthe like, not here shown. Air delivered in this manner has comparativelysmall pressure but it travels at great velocity. It will therefore passforwardly through the casing a and through the discharge nozzle 2, beingfinally permitted to discharge through the annular opening 30 formedbetween the nozzle end 25 and the flange 20 of the atomizing cup, theair being here directed at right angles or radially with relation to thecup. The air during its passage through the nozzle, engages the inclinedface presented by the spiral-shaped vane 27. A rotary movement is inthis manner imparted to the hollow shaft and the centrifugal atomizercarried thereby and it will therefore atomize the oil delivered to thecup and also project the same. The number of revolutions obtained inthis manner depends entirely upon the velocity of the air and theincline or pitch of the spiral-shaped vane. It should, however, in allinstances, approximate or preferably exceed 2000 revolutions per minute.In actual operation, it is found that the oil delivered to the interiorchamber 21 is discharged radially through the opening 16 into the bottomof the cup and here spreads out in a thin film over the interior wall ofthe cup and as this wall is inclined, it can readily be seen that itWill travel outwardly to the lip 20 and will then be projected as a thinannular sheet of vapor. This vapor mixes with the air discharging fromthe nozzle end 25 and a homogeneous combustible mixture is in thismanner produced. The flow of the air is in this instance divided as aconsiderable portion of'the same is permitted to enter the cup throughthe longitudinal openings 15 formed in the head. This air dischargesthrough the annular opening 31 formed between the cap plate and the lipof the cup, thus discharging air also on the forward side of theprojected oil vapor. In other words, air is delivered to both sides ofthe highly vaporized oil and is therefore permitted to intimately mixwith the same before combustion takes place. The flame produced in thepresent instance is circular in formation and may be spread over aconsiderable area, the size of the flame being controlled to a greatextent by the volume of oil delivered.

The air passing through the centrifugal atormzer promotes combustion,due to the fact that it permits a more intimate mixture resales of theair and oil and it also serves the function of preventing carbonizationof the oil within the head as it retains the head sufficiently cool toprevent carbonization. The air passing through the nozzle 2 also servestwo functions; first,-that of rotating the centrifugal atomizer; andsecondly, that of supplying a sufficient quantity of air to supportcombustion. The air passing through the nozzle also serves anotherfunction, to-wit, that of maintaining the main bearing and the shaftsupported by the same, cool, thus preventingoverheating of the same andsimilarly, reducing lubricating troubles.

A burner constructed, as here shown, is simple and substantial inconstruction and may be regularly applied to practically any type offurnace. It is, however, preferably designed to assume a verticalosition when in operation and may, therefore, be in-' serted directlythrough the bottom of a fur nace, if desired. The longitudinal adjustinent of the nozzle 2 with relation to the casing A. and the dischargelip 20 of the atomizing cup is an important feature as it not onlycontrols the volume of air discharging through the annular opening 30but it also controls the volume of air passing through the atomizingcup, thus permitting an adjustment which will maintain an idealtemperature at this point and which will also, to a large extent,regulate the number of revolutions imparted to the atomizer.

VVhilethe burner here shown is more or less specific in construction anddesign, I wish it understood that it may be varied within the limits ofthe scope of the claims; similarly, that the materials and finish of theseveral partsmay be such as the experience and judgment of themanufacturer may dictate.

Having thus described my invention, what I claim and desire to secure byLetters Patent is- 1. In a burner of the character described a headmember, a hollow shaft supporting the same, a centrifugal atomizing cupsupported by the head member, a central cylindrical extension formed onthe head member, a cap supported thereby, said cap being spaced withrelation to the centrifugal atomizing cup to form an annular dischargeopening, an oil delivering pipe extending through the hollow shaft andthe head member, said pipe adapted to deliver oil to a chamber formedwithin the cylindrical extension on the head member, a plurality ofradially disposed openings formed in the head member communicatingwithsaid central chamber and with the centrifugal atomizing cup to deliveroil thereto and a plurality of openings formed in the head member fordelivering air to the interior of the centrifugal atomizing cup.

2. In a burner of the character described a head member, a hollow shaftsupporting the same, a centrifugal atomizing cup supported by the headmember, a central cylindrlcal extension formed on the head member, a capsupported thereby, said cap being spaced with relation to thecentrifugal atomizing cup to form an annular discharge opening, an oildelivering pipe extending through the hollow shaft and the head memher,said pipe adapted to deliver oil to a chamber formed within thecylindrical extension on the head member, a plurality of radiallydisposed openings formed in the head member communicating with saidcentral chamber and with the centrifugal atomizing cup to deliver oilthereto, a plurality of openings formed in the head member fordelivering air to the interior of the centrifu gal atomizing cup, and anozzle partially surrounding the centrifugal atomizer and the shaft,said nozzle being connected with a source of air supply.

3. In an oil burner of the character described, an outer casing and anozzle in line therewith having a divergent discharge end, a hollowrevoluble shaft, having a head member with a divergent cup concentricwith the nozzle and a concave outer cap plate facing th'e'cup and spacedtherefrom, both cap and cup having similar concentric peripheries, aninterior concentric oil pipe with discharge ope'nings within the headand a plurality of inverted mixing cups, radial passages in the headthrough which oil is discharged between the outer cap and cup flanges,and longitudinal openings through the head, through which air underpressure from the rear of the nozzle is mixed with the oil.

4. In an oil burner of the character described an outer casing, a nozzlein line therewith having a divergent discharge end, a hollow rotatableshaft journaled in the casing having a head member with a divergent cupconcentrically positioned with relation to the nozzle, a concave outercap plate facing the cup and spaced therefrom to form an annulardischarge opening, an interior concentric oil pipe passing through thehollow shaft and stationary with relation thereto, a plurality ofradially disposed discharge openings formed in the end of said pipe andadapted to deliver oil to the cup, longitudinal openings formed in thecup through which air under pressure from the rear of the nozzle mayenter, and means carried by the shaft and actuated by the air forimparting a rotary movement to the shaft and cup.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing Witnesses.

ISAAC M. SHARP.

Witnesses:

G. M. BALL, J. H. HERRING.

